A031292 Position of n-th 5 in A007376.

5, 21, 41, 61, 81, 90, 92, 94, 96, 98, 100, 101, 102, 104, 106, 108, 121, 141, 161, 181, 207, 237, 267, 297, 327, 341, 344, 347, 350, 353, 356, 357, 359, 362, 365, 368, 387, 417, 447, 477, 507, 537, 567, 597, 627, 641, 644, 647

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• less
• base

Comments

A007376(a(n)) = 5.

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A193428; A031287, A031288, A031289, A031290, A031291, A031293, A031294, A031295, A031296.

Programs

Haskell

import Data.List (elemIndices)
a031292 n = a031292_list !! (n-1)
a031292_list = map (+ 1) $ elemIndices 5 a007376_list
-- Reinhard Zumkeller, Jul 28 2011